E505 · Acidity regulators
Ferrous carbonate
An iron source not on the EU additive list; safe at fortification levels.
- Category
- Acidity regulators
- Vegan
- Yes
- Vegetarian
- Yes
What it is
A mineral salt historically used in food fortification as a dietary source of iron.
How it is used in food
Provides dietary iron and acts as an acidity regulator.
Commonly found in- Dietary supplements
Health and safety
Generally safe. It is an inorganic source of iron, though it has poor bioavailability compared to other iron supplements.
Evaluated by food safety authorities and determined to be unsafe for general food use.
Regulatory status
| Region | Status | Notes |
|---|---|---|
| Australia & New Zealand FSANZ |
Not approved | Not approved for general food use or historically banned due to safety concerns. |
| European Union EFSA / European Commission |
Not approved | Not on the EU authorised list of food additives (Annex II). |
| United States FDA (Food and Drug Administration) |
Not approved | Not approved for general food use or historically banned due to safety concerns. |
Identification on labels
- E-number
- E505
Worth knowing
Ferrous carbonate is naturally found in the mineral siderite.
Conclusion
An unauthorized iron compound.
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Open the appEntry last reviewed 2026-07-28.
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